Poly(vinyl chloride)‐dioctyl phthalate‐ethylene vinylacetate copolymer compounds of different composition were studied by combination of various computer controlled mechanical and dielectric relaxation techniques. By the high resolution (low effective frequency) quasi‐static methods multiple transitions in the glass‐rubber transition range were found which were shifted by increasing additive concentration according to the additivity rule of free volume. Transition temperatures detected by mechanical and dielectric techniques were found to coincide satisfactorily taking into account shifts due to differences of effective frequencies as well as loads.
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Hedvig et al. (1981) studied this question.
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